!7811 修改inputmethod 3.1release

Merge pull request !7811 from mashaoyin/OpenHarmony-3.1-Release

zh-cn/application-dev/reference/apis/js-apis-inputmethod.md

@@ -7,7 +7,7 @@
 ## 导入模块
 
 ```
-import inputMethod from '@ohos.inputMethod';
+import inputMethod from '@ohos.inputmethod';
 ```
 
 ## inputMethod<sup>6+</sup>

zh-cn/application-dev/reference/apis/js-apis-inputmethodengine.md

@@ -6,7 +6,7 @@
 ## 导入模块
 
 ```
-import inputMethodEngine from '@ohos.inputMethodEngine';
+import inputMethodEngine from '@ohos.inputmethodengine';
 ```
 
 ## inputMethodEngine